Nasty color bleed on pushed A7III RAW (compressed, silent shutter)

Started 7 months ago | Discussions thread
SilvanBromide Senior Member • Posts: 2,986
Re: SONY steep short+wide optical projection to sensor is cause (not file format related)

PhozoKozmos wrote:

SilvanBromide wrote:

mrbenji wrote:

PhozoKozmos wrote:

SONY steep short+wide optical projection to sensor is cause (not file format related)

anything in foreground out-of-focus will have an expanded blurred ghost

but if it is projected at a very wide-angle onto a very close sensor surface, more of the ghost can be spread farther across more adjacent pixels and pick up the extra light

unlikely, file format related, as ooc (fine only) Sony jpeg paired with Sony RAW will exhibit same effect (regardless of compression or not, and mechanical shutter or not)

RAW, whether ARW or DNG will be same

one can call this effect, Sony wide-projection-on-sensor-bokeh, instead of shallow dof optical lens-bokeh

Thank you so much... this is the most helpful explanation yet.


It's possible to recreate the effect using adapted lenses, or even on a dSLR (where, in either case the angle of projection onto the sensor would be comparatively shallow).


Say what? An example image from a dSLT camera (with considerably longer FFD) has been posted in the thread and shows a comparable (and equally extreme) effect. You appear impervious to evidence.

no one disputes blur goes outside boundaries of oof subjects.

That much it seems we can agree on.  ; )

however, the extremeness of that blur bleed, can be better accounted for by high steep theta angles (extreme short convergence on a wider FF sensor too close)

No need to account for it in that way, since it can be fully accounted for as the overlaying of an OOF outline, the particular geometry of the overlay (at a given FL and aperture) being a function of the closeness off the OOF object to the lens.

exacerbated by thicker sensor stacks

both common on FF Sony mirrorless icl dcams

Really? You appear to be seeing something in the OP's image that I'm not.

So the backlighting had nothing to do with it, other than the effect being enhanced by the extreme shadow/highlight recovery. I simply hadn't experienced or heard of this effect before, but as I've always said, one of the best things about photography is that you're always learning.

Yes. The presence of foreground objects that are well in front of the field of focus effectively 'superimposes' a field of blur in front of adjacent areas of the focussed image and the background. Totally normal - for any camera, not just ML, if not what you expected in this particular shot.

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